Could not load file or assembly 'Telerik.Sitefinity, Version=6.1.4300.0, Culture=neutral, PublicKeyToken=b28c218413bdf563' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.FileLoadException: Could not load file or assembly 'Telerik.Sitefinity, Version=6.1.4300.0, Culture=neutral, PublicKeyToken=b28c218413bdf563' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Telerik.Sitefinity, Version=6.1.4300.0, Culture=neutral, PublicKeyToken=b28c218413bdf563' could not be loaded.

You can find detailed instructions on how to both Migrate and Upgrade a Sitefinity project in our Documentation. All additional steps you need to take are described in the articles.

Regarding the exception you are getting - it is a fairly common one. Basically your solution still requires an old version on one (possibly more) assembly. This can easily be fixed by adding a binding redirect at the end of your Web.config file before the closing </configuration> tag:

Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Sitefinity CMS Ideas&Feedback Portal and vote to affect the priority of the items

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